What is a feat or exploit, usually a praiseworthy act, called?

In medicine, what does LDL, a fat- and cholesterol-carrying molecule, stand for? Which word names both a deadly disease of cattle and the band that recorded the 1985 album "Spreading the Disease"? Mr. Wilson is the long-suffering neighbor in which comic strip? Which cocktail is made with vodka, tomato juice and spices? A February 3, 2011, tweet said a pro-democracy crowd had taken over the 6th of October Bridge in which capital? A fedora, a homburg and a derby are all types of what? A feisty prisoner enters an insane asylum, stirs up the other inmates and is lobotomized in which 1975 film? A "fellow traveler" sympathizes with which party but is not a member?